Periscopic viewing device



FIG. 1 is a front elevation of a periscopic viewing _device showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a side elevation thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a cross-section taken on line 6--6 of FIG. 1. 

The ornamental design for a periscopic viewing device, as shown. 